IS 12687 : 1989 Small Tools - Subland Twist Drills with Morse Taper Shanks for Holes Prior to Tapping Screw Threads - Specification

1 Scope

1.1 This standard covers dimensions and other requirements forthe subland twist drills with morse taper shanks for producingholes and countersinks prior to tapping screw threads M 8 to M 30(coarse pitch) conforming to IS 10952 : 1984.

2 References

IS 1715 : 1986Dimensions for self holding tapers

IS 5099 : 1983Technical supply conditions for twist drills

IS 7778 : 1975Methods for sampling small tools

IS 10915 : 1984Terms, definitions and types of twist drills

IS 10952 : 1984Recommendations for drills for use prior to tappingscrew threads